Casing-cutting tool



CT C. HANSEN.

CASING CUTTING TOOL.

APPLICATION FILED IuNE 22.192I.

m5 ATTb EY unirsi) STATES PATENT OFFICE.

CHARLES C. HANSEN, 0F EASTON, .PE-NNSYLVANIA, ASSCGNOR TO INGERSOLL-RAND COMPANY, 0F JERSEY CITY, NEW' JERSEY, A CORPORATION OF NEW JERSEY.

CASING-CUTTING TOOL.

Application filed June 22,

To @ZZ whom t may concern Be it known that l, CHARLES C. HansnN, a citizen of the United States, and a resident of Easton, county of Northampton, State of Pennsylvania, have invented a certain CasingeCutting Tool, of which the following is a specification accompanied by drawings.I

This invention relates to boring drills and more particularly to apparatus forming a part of such drills for cutting or separating the casing while in the well so that the upper part of the casing may be cut off and removed or else the lower collapsed part of the casing may be disintegrated by blasting or cut out by a calyx tool.

In the drilling of wells a cylindrical casing is sunlr forming a lining in which the drill bit operates. Such wells are often sunk to considerable depths so that if a portion of the casing collapses, the removal of the casing or lining or any part of it presents peculiar difficulties.

The object of the present invention is to enable the upper portion on portions of a cylindrical well casing or lining` if desired to be easily and quickly removed from the hole if the casing sticks or becomes jammed, by cutting the casing at any desired point or points above the jammed portion, the cut sections being readily raised to the surface of the ground in any desired manner, and also to permit the disintegration of lthe lower portion.

A further object is to accomplish the above cutting operation by means of a simple compact apparatus forming a part of the drill and operated and controlled by the same means which operate the drill.

Further objects of the invention will hereinafter appear and to the ends set forth,y the invention consists of the features of construction and combinations of parts described and claimed in the following specifications and shown on the accompanying drawings, forming a part hereof, which illustratesv one preferred practical embodiment of the invention, in which- Figure l is a longitudinal view partly in section of a drill bit embodying the casing cutter, as the parts appear prior to insertion of the bit within the casing;

Figure 2 is a longitudinal sectional view on the line 2--2 of Figure 4 and at right angles to that shown in Figure l, showing Specification of Letters Patent.

Patented Feb. 14, 192,2.

1921. Serial No. 479,535.

the. apparatus in operation within a well casing;

Figure 3 is a transverse sectional view taken on the line 3-3 of Figure l, showing the cutters in retracted position;

Figure 4l is a transverse sectional view on the line lf-tof Figure 2, showing the cutters in operative cutting position;

Figure 5 is a perspective view of the cam or wedge member, for operating the cutters, and

Figure 6 is a similar view of the jar block for imparting blows of impact to the cam or wedge member.

ln the drawings a cylindrical. well casing A is shown forming a lining for a drilled hole. rlhe casing cutting apparatus consists of the usual hollow cylindrical barrel B having a drive head C threaded into and enclosing the upper end and a guide plug D threaded into and closing the lower end. A hollow drill rod E of usual form is screwed into the drive head C and this drill` rod E is adapted to be rotated by any suitable and usual means commonly employed to rotate a well drilling tool to effect rotation of the barrel B. The apparatus may be adapted to feed water through the drillto facilitate the boring but as this feature forms no part of the present invention it will not be described in detail.

A cylindrical hollow two part plug F is secured within the lower part of the barrel B by screws G or any other desired means. This two part plug` F has a longitudinal passage or opening H preferably of rectangul ar cross-section and a transverse Opeliing J is formed approximately centrally thereof. In the opening J a pair of oppositely disposed critters K and L are mounted, which are normally withdrawn within the periphery of the barrel B but in operation are adapted to be moved outwardly so that the cutting edges M and O respectively extend through apertures P and Q, in the wall. of the barrel B and engageJ the wall vof the well casing A which is desired to be cut. Rotation of the barrel B in the direction shown by the arrows, Figure il, causes the cutting edges M and O to malte a circular cut P through the Wall of the casing A.

The cutters are pushed into extended position to forcibly engage the wall of the casing Cil A by means of a longitudinal cam or wedge member R which acts to torce the cutters apart by a wedging` action. This member l is generally angular in section to lit the passage H. in the plug F and the lower end portion S is adapted to slide in the said passage El so that the member R rotates with the barrel B. rlhe said portion S ot the member R is termed with oppositely inclined longitudinal cams or wedges T and U Aand the cutters K and L have portions oi their contiguous sides cut away forming recesses ll and lil with which the inclined edges ot the wedge member portions 'll and U respectively are adapted to engage. The ends K of the wedge portions T and U may be reduced in width for a short distance, so that the wedge portions may withdraw 'the cutters and lie within the recesses V and lV when the wedge member is raised without forcing the cutters K and L outwari'lly 'and the length ot the wedge member lt is suoli hat the upper end or head Y may be drawn up against the lower surface ot the drill head (l and held there when the cutters are not in use.

Above the wedge portions T and U the member l is provided with shouldered lugs Z and a. reduced stem u of .any desired length connects the body of the member with the head Y. A cylindrical jar block o is adapted to slide on the stem a within the limits allowed by the lugs Z and head Y, the jar block o being recessed and open at one side to enable it to be placed over the stem a. One end of a length of wire or any other rope e is secured at f' to the upper end oit the jar block Y) and passes through a lon- `gitudinal passage g in the drill head C. lhe opposite end ott the rope is secured by means of a. suitable clamp 7i to the drill rod E at any desired point and may be tied to hold the wedge member .in uppermost inoperative position as shown in Figure l. lt is to-be understood. 'that the drill rod and the rope may be oilE any desired length, according; to the depth of the holeT the es sential 'Feature being that a portion off the rope is accessible to th-e drill operator for pulling up and dropping the jar block upon the wedge member to impart blows of impact, when the rope `is loosened. i

ln the operation ot the apparatus, when it is desired to` cut oft a section oit well cas'- iug. the barrel ld is adjusted within the well iasing to the depth desired and rotative movement imparted to the barrel in the usual manner as in drilling. The rene e is loosened so that the wedge membef and. Uyar block are lowered to the position indicated in Figure 2. As the barrel rotates the operator repeatedly grasps the rone. c and pulls on the saine and then lets ,oie sok that the block falls on the shouldered lugs Z, hammering the wedge member and forcing it downwardly. .The oppositely inclined portions T and U of the wedge member enoao'e the cutters ,as the wedge member is driven downwardly, and the cutters are liorced outwardly, engaging the inner wall oi' the well casing and cutting a circular groove ol: increasing depth until the desired portimi ol the casing is completely severed Afrom the remainder. The wedge member serves Vto maintain the cutter tightly against the well casing during the cutting. lllhen it is desired to withdraw lthe cutters the rope e is pulled upward and the wedge member R is thus retracted to its normal position, the head Y engaging the lower suritace of the drill head C and the cutters, ol lowing` the inclined portions T and are restored to their normal position `in the transverse Vbore J within the circumferential limits of the barrel. When the casing has been out the severed portion is readily removed in any desired manner.

This lorin ol casing cutter has been found ellicient in use, is simple in construction and chiap to manufacture. :lVhile the specific form shown has been found to be a preferred "form of device for carrying out the objects' oi the invention, other forms may occur to those skilled in the art and scope of the linvention as defined in the appended claims; hence it is not desired to limit the invention to the form herein speeically shown and described.

l claimf l. A casing cutting tool comprising a barrel adapted to be rotated in a Well casing, oppositely disposed cutters mounted transversely. in said barrel and normally held within the circumferential'limits thereoitj a wedge member engaging said cutters and a` jar bloot adapted to 'intermittently 'forcibly engage said wedge member forcing the cutters outwardly.whereby said cutters engage the well casing and cut a. circular groove of increasing depth `therein as the barrel rotates` separating a portion of the easing from the remainder.

2. A easing cutting tool comprising a barrel adapted to be rotated in a well casing, oppositely ydisposed cutters mounted transversely in said barrel and normally held within the circumferential limits thereof, a wedge member having oppositely inclined vportions engaging said cutters for moving vsaid cutters outwardly to engage the Wall of the casing, a. jar block slidable on said wedge member. and manualfmealns for raisineand lowering said iar block whereby the ier block forcibly engages the wedge member and the cutters are forced outwardly cutting a. circular ygroove of increasing depth in the well casing as the Vloarrelro-l tates and severing a portion of the casing :trom the remainder.

I3. A casing cutting Vtool comprising 'a barrel adapted to be rotated in a Well easing, Wedge member, to force the cutters outoppositely disposed Cutters mounted transwardly as the barrel rotates, said manual lo Versely in said barrel and normally held means being also adapted to withdraw the within the eireumferential limits thereof, a Jar block and Wedge member to restore the wedge member engaging` said Cutters, a jar vCutters to normal inoperative position.

block sliclable on said Wedge member and ln testimony whereof I have signed this manual means for raising and lowering` said specification.

jar block for intermittenly jarring said Y CHARLES C. HANSEN. 

